Part of the ‘charm’ of this building is that there is an interior stairway that leads up to a door opening that leads to an exterior stairway that goes up to the porch. I adjusted the Brightness and Contrast to peer into the darkness. Horizontal boards against the far wall. The ceiling is angled up from that back wall to above the door opening – these are oriented vertically. THey are not the same boards used on the exterior .. but still fairly wide.
The exterior wall is interesting – pretty much telling that this was all done at some later point in the building’s history. We have a wall that looks to be around 7.6″ wide. 1″ thick casing and interior siding. I guess someone like a carpenter might be able to piece together what the heck is going on here but I can reproduce it.